Before, they had to wait with Tectonic Edge until the opponent had four lands on the battlefield and then hinder their own growth, but Field of Ruin has completely changed that

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You choose a nonland card from it [with mana value 2 or less]
At some point, its much more likely that I have been given a weighted coin than that it just happened to land on heads so many times
Whether thats mana dorks and fast mana, generating oodles of mana with a Cabal Coffers or Black Market, or just playing a Wood Elves, all decks enjoy different types of ramp
They were just too inefficient compared to Necropotence